Universal Journal of Geoscience Vol. 1(2), pp. 65 - 68
DOI: 10.13189/ujg.2013.010204
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Survey of Chromites Fields Adjacent Rocks Loosening in Case of Their Uncontrolled Caving


Haini-Kamal Kassymkanova, Gulnar Jangulova, Jeniskul Bastaubaeva*, Gulbanu Baidauletova
Al-Farabi Kazakh National University, Almaty, Republic of Kazakhstan

ABSTRACT

Control and regulation of the formation behavior while using the uncontrolled caving method require thorough investigation of the formation properties and structure, its geological, geostructural and geotechnical parameters as well as geomechanical peculiarities of rock pressure generation and its effect in the course of ore deposits mining.The most indicative are the mining plants of Donskoy Mining and Concentration Complex, which operate the uncontrolled caving method for mining of thick ore deposits at the chromite ore fields.The fields ofSouth-Kempirsay chromite-bearing block are the second largest fields comparing to Republic of South Africa and Zimbabwe. Prospectivity and extent of the operations at the fields could be described by the rate of production and its development: “Molodyozhnaya” mine of 2.0 million tons annual output is the world largest underground mining of chromite ore.Currently mining of ore deposits at Donskoy chromites fields is carried out at rather significant depths (of 500 and more meters), the second working of subjacent strata is carried out as well.Along with the extension of second working areas under the specified conditions, carrying out of the large-scale development operations and pre-production development as well as generation of closed extraction mines, there is the necessity to ensure more rational regulation of the rock pressure, provision for safe structural components of the mining system, selection of the methods and means for mine workings fixing and, finally, provision of efficient and reliable system of ore deposits mining. In applying this system it is critical to determine the caving zone sizes, which could be calculated quite easily depending on the ore body parameters, direction and sequence of its reserves development, whereas its height would depend on the extent of the increase of the caving rock block volume due to its loosening. This article outlines the results of laboratory tests on determination of the volume of loose rocks, which is calculated on the basis of the loosening factor (kp) that represents the “...ratio of the rock volume in loose (bulk) state to its volume as the solid block…”.

KEYWORDS
Geomechanical Processes, Loosening Factor, Method of Testing, Laboratory Testing

Cite this paper
Haini-Kamal Kassymkanova , Gulnar Jangulova , Jeniskul Bastaubaeva , Gulbanu Baidauletova . "Survey of Chromites Fields Adjacent Rocks Loosening in Case of Their Uncontrolled Caving." Universal Journal of Geoscience 1.2 (2013) 65 - 68. doi: 10.13189/ujg.2013.010204.